Apparatus for making condensers



P. THOMAS.

APPARATUS FUR MAKING cownfwsffis.

APPLICATION FILED MAY2J`, IQiL,

aented Juy 12, 1921.

Ii I I l l I l l;

)ENTOR 7 Phi/lips 77mm PmLLrrs Timms. o F Enenwoon Puur, PENNSYLVANIA,AssIGNoa *ro Wrisrnm` HOUSE ELECTRIC AND MANUFACTURING SYIVANIA.

COMPANY, A CORPORATION 0F PENN- APPAQBATUS FOR MIAKING CNDENSEBS.

To allwhom 'it may concern.

Be it known that I, PHILLIPS THOMAS, a citizen of the United States, andal resident of Edgewood Park, in the county of Allegheny and State 0fPennsylvania, have ,inyented a new and useful Improvement in Apparatusfor Maln'ng Condensers, of which, the following is a specification.

y invention relates -to the manufacture of electric eondensers of thewound type and other articles composed of compressed laininations, andit has for one of its objects to provide a simple and effective methodof compressing such objects evenly and without wrinkling or distortion.

Another object of my invention is to provide a press for progressivelyapplying,r pres` sure to the articles produced in the course of theabove-indicated method.

In the accompanying drawing, Figure 1 is a side elevational view of apress constructed in accordance with my invention and shown inengagement with a condenser of the -wound type. Fig. 2 is a sideelevational view showing a modified form of press, and F ig. 3 is a sideelevational view of the press shown in Fig. 23 showing the relativepositionsr of the platens and the pressure-applying springs at the finalstage of the pressing operation.

The wound-type condenser, consisting,r of alternate strips of aconductor and a dielectric materia wound together and coinpressed, mayhe manufactured cheaply on a commercial scale but is subject to thedisadvantage that considerable electrical leakage and variation incapacity are likely to occur in eondensers which are pressed betweenflat platens in the usual manner. because some of the turns are likelyto wrinkle. formingr weakened or broken spots. It is a primary purposeof my present invention to compress eondensers of this type in suchmanner that wrinkling is entirely avoided and the condenser therebyrendered uniform and durable.

In carrying out my present method, alten nate Strips of a conductor.such as tin foil. and an absorbent material, such as paper. are placedtogether and wound upon a suitable mandrel. The mandrel is then removedand the roll of material is impregnated in a suitable dielectricsubstance, such as paraffin, halogenated wax or the like. Theimpregnated roll, which should be somewhat flatl. Specifications!Letters Patent.

tened, either by drel or by a reliminary compression, is then compressebetween pressure members which are so arranged as to apply :pressureprogressively to the condenser, the ri-gressive application` of pressureresulting in smoothing out any wrinkles that maylteiid to form withinthe condenser and producing a uniform structure.

he progressive application of` ressure referred to above may beaccomplished `in several ways, two of which are illustrated intheaccompanying drawing, to` Fi l f which reference may now 4be had.press comprising a stationary platen 1 and a movable platen 2 is showninposition to compress 'a condenser 3, pressure being a plied from theplatens 1 and 2 to the con enser through oppositely curved resilientpressuretransmitting members 44 and-5 which are preferably formed ofsheet metal and which are carried respectively by the latens 1 and 2.The yattachment between t e s ring members 4 and 5 and their respectivep atens' should be snch'that the spring members may move somewhat withrespect to. the platens as they are straightened during the pressingoperation. As shown, such a means of attachment for each springr ressuremember isvafforded by a pair of roilers 6 which are carried in bearings7 secured to the ndjacent platen.

In the' operation of the-press whichl have just described. the s ringmembers 4 and 5 first engage the con enser 3 along its centrallongitudinal line, as shown in Fig. 1. As the platen 2 is lowered, themembers 4 and 5 are fiattened to press the condenser with a progressiverolling movement from the center line outward the condenser. Thiscombined rolling and pressing action serves to iron out any wrinklesthat may tend to form'hwithin the body of the condenser. i

An alternative modification of the abovedescribed press is shown in Fig.2, in which the platens 1 and 2'carry spring-pressure members S and 9,respectively, the pressure members 9 and lObeinglr curved in the sainedirection so as to be substantially parallel. The springr member 9, is4attached to the platen 1 by means of rollers 6, as in the press shownin Fig. 1,^whil,e' the sprin meinber 10 is welded or otherwise rigilyattached, at its center, to tliefplaten 2.

tPatented Juiy 12, 1921. iippmmam med may 27, 191s. serial No. 100,391.

vwinding upon a flat'inanf toward the edges of` -In the'operation ofthis form of press, the loosely wound roll 3 is first placed upon thelower and upwardly curved spring-pressure member 9. The downwardmovement of the platen 2 first serves to bend the condenser 3 into thecurved form shown in dotted lines fat 11, Fig; 2V `The downward movemento the platen 2 beingV continued, the spring members 9 and l() areflattened to thereby straighten the condenser and bring,r it to the formshown in Fig. 3. The straighteningof the condenser'during this stage ofthe pressing operation progresses from the center line outwardly towardthe edges, and

16 the effect of this action in preventing wrinals klingof the condenserlayers is the same as in the ress shown in Fig. l.

The paratus which I have shown and descl'i is intended to be merelyillustrative, it being understood that other forms of apparatus may bereadiLy devised for carrying outI my method, which broadly com-.

prises the progressive application of pressure to a Vrolled object forthe purpose of compactih it lin an-even and unwrinkled manner. ince myinvention may be thus variously modified without departifig from itsscope, it is to be understood that no limitations are to be imposedthereon except such as are indicated in the appended claims.

`l c1aim.as my invention:

l. A. press comprising a pair of platens adapted to coperate to compressan object between them and a curved, resilient pres` sure-transmittingmember attached-to each of the said platens and adapted to progressivelyengage the said object.

2. A press comprising a pair of platens adapted to coperate to compressan object between them and a4 pair of oppositely curved, resilientpressure-transmitting mem bers severally carried by the said platens andadapted to engage the said object centrally and thereafter toprogressively exert pressure upon the said object outwardly toward itsedges.

3. A press comprising a pair of relatively movable platens and resilientmembers in partial engagement with the platens and adapted to beflattened thereagainst by enside edges as the members are flattenedagainst the platens.

5. A press comprising relatively movable platens and a bowed resilientmember having portions adjacent to its edges slidably mounted upon oneof the platens and its intermediate portions spaced therefrom` 6. Apress comprising relatively movable platens, a bowed resilientl memberhaving portions adjacent to its edges slidablymounted upon one of theplatens and its intermediate portions spaced therefrom and a secondbowed resilient member carried by the other )laten and cooperating withthe first bowe member.

7. A press comprising a pair of relatively movable platens and aresilient member in partial engagement with one of the platens Y andadapted to be flattened thereagainst by engagement with an interposedobject and to successively, and with increasing force, compressincreasing areas of the object from its centerto it'sside edges.

B. A press comprising a pair of relatively movable platens and ayielding plate member having portions adjacent to its edges permanentlyin engagement with the face of one of the platens and laterally `movablethereon and having its intermediate portions normally spaced from saidplaten face by amounts varying from '/.ero at its edges to a maximum atits middle portion and being movable to close said space when subjectedto face pressure.

In testimony whereof, l have hereunto subscribed my name this 17th dayof May, 1916.

vPHILLIPS, THOMAS.

